DSLR - Cosmetic Correction and Dithering

[jwaters125]

Simple question - If a person does a good job at Dithering (moving the mount enough, Dithering every frame ...) is doing Cosmetic Correction necessary?  Do you gain anything?

I use a Ha Mod Canon 6D and stock Canon 5DMkIV.

[acmalko]

Yes !
You still have hot or deviant pixels after the masterdark substraction

[dld]

Hello, I have the 6D too and I don't do cosmetic correction. Dithering deals well with any hot/cold/stuck pixels and helps a lot with fixed-pattern noise.

(edited after Andres' comment)

[jwaters125]

There are my thoughts too but I have come across several posts saying it makes a small improvement.

If I don't Dither I do Cosmetic Correction.

[bulrichl]

There are my thoughts too but I have come across several posts saying it makes a small improvement.

If I don't Dither I do Cosmetic Correction.

I consider dithering even more important than cosmetic correction: dithering will attenuate / remove fixed pattern noise, cosmetic correction cannot achieve that.

Bernd

[Geoff]

And besides, cosmetic correction invents data to replace the defects. Dithering preserves the original data.

[dave_galera]

Another vote for dithering over cosmetic correction

[Andres.Pozo]

Pixel rejection is done after the interpolation in StarAligment. The interpolation of PixInsight works great but it can not avoid spilling the value of the bad pixel into the surrounding pixels. The surrounding pixels now have a slightly higher value that is below the rejection threshold but can skew the mean.

I do both: CosmeticCorrection and Dithering.